PDF malware analysis — malicious · 0d8b5a08fd9aef07

MALICIOUS

PDF

5.8 KB Created: 8049-53-79 96:13:06 -91:15 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)

MD5: 1322c99d510c3e46947f92edc3c87ccd SHA-1: 5f8247c87025be8c0261e4ccbe280da3b3e7506d SHA-256: 0d8b5a08fd9aef07c0aefaf7da7b04e017f424a9e74e724a4804a140efc5181a

338 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exploits CVE-2007-5659 using embedded JavaScript. The script decodes and evaluates a second-stage payload, which is likely a downloader or exploit. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary technique being exploitation for client execution via JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 10

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35551 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0028_000.js` `5aac975152f1e5653c50f87e64d78a4fe89476436a7ebbdf91a99b1206b7b1f2`	pdf-javascript-stream	PDF /JS object 28 at offset 0x541	3831 bytes
Detection ClamAV: Pdf.Exploit.Agent-35551 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `9ee3585fe69174c14ef27883611f3489d1d6261bab55f30af94e943ea11dc59f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x8E1	2213 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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